ML20085E467

LER ER-76-028:on 760823,Group 3 Rods Moved While Group 4 Rods Inserted by Manual Sequential Mode.Event Classified as Reportable on 760826.Cause Not Determined

ML20085E467
Person / Time
Site:	Palisades
Issue date:	09/09/1976
From:	Bixel D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
LER-ER-76-028, LER-ER-76-28, NUDOCS 8308120116
Download: ML20085E467 (3)

Text

. s O UCENSEE EVENT REPORT a

l CONTROL 8 LOCK:l l l l l l l (ptgAgg PAINT ALL REGUIRED INFORMATION) 1 6 NAM LOENSE NUM8ER T PE TY 01 l MlIl Pl Al Ll 1l l0 l 0 l-10 l 0l 0l 0 l 0 l-l0 l 0 l l h l1 l1l 1l1l l0 l1l 7 89 14 15 25 28 30 31 32 TYv NE 00CxET NUMBER EVENT DATE REPORT DATE O1 CONT l l l l 0 l 5 l 0l-l 0 l2 l 5 l 5 l l 0l8 l2 l 6lT l6l 74 l0l9l0l9l7l6l 75 80 7 8 57 58 59 60 S1 88 69 EVENT DESCRIPTION

@ lme ovone n,-,,...a nn A_co -re; but was not classified as a reoortable event until l 7 89 80

@ l8-26-76. At about 1500 hours0.0174 days <br />0.417 hours <br />0.00248 weeks <br />5.7075e-4 months <br /> with all rods withdrawn, an operator attempted to l 7 89 80

@ l insert Group 4 rods using tile ' manual sequential mode." It was observed that Group l 7 89 80

@ l3 also m'ved. This overlap is not designed to occur until Group h has been in- l f serted to 51" above the bottom of the core. Thesystemwas(seeLine18)(ER-76-28)8j 7 89 psene 80 DE 00E COMPONENT CODE VOLAT 1DN

@89lRI Bl [F_) lIl Nl SlT l R l Dl W l F]1l 2l 0l lYl 7 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION gg l Preliminary investigation at the time of occurrence did not disclose the source of l 7 89 80 Q l the problem. The following morning the system was found to operate normally in all l 7 89 80 Q l modes and the previous evening's problem could not be duplicated.(see attached sheet) sa s  % POWER OTHEA STATUS 0 CVE DISCOVERY DESCRFTON 7 8 9 W l0 l 0l 1l l 10 12 13 NA l 44 W45 l

46 NA 80 l

A E O E ASE AMOUNT OF ACTMTV LOCATON OF RELEASE 7 8 9 W Wl 10 11 NA 44 l l 45 NA 80 l

PERSONNEL EXPOSUAES NUMBER TYPE DESCRATON BE l 010 l0 l 7 89 11 Wl 12 13 NA 80 l

PERSONNEL INJURIES NUMBER DESCRIPTON E l0l0l 0l11 12l 7 89 NA 80 l

PROBABLE CONSEQUENCES DE l None. Power level and rod motion was too small to cause undesirable effects. l 7 89 80 LOSS OR OAMAGE TO FACTUTY TYPE DESCRPTON

@ [,Z_j l NA l 7 89 10 80 PUBLICITY DE l None. l 7 89 80 ADDITIONAL FACTORS

] l operated satisfactorily in the " manual group" mode during this period of time. l 7 89 80 EI 80 7 89 B308120116 760909 PDR ADOCK 05000255 S PDR

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O o l LER 76-28 Palisades (Continued From Line 10)

The system has continued to operate properly until the present time and consequently we are unable to determine the cause of the problem. We plan to exercise the asso-ciated relay from the computer terminal during the next scheduled outage in an attempt to duplicate this problem. If this attempt fails and no hardware dis-crepancies are found, the computer program will be revieved for any oversight which may have permitted the problem to occur.

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l1 i Generei Offices: 212 West Michegen Avenue, Jeckson. Michsgen 49201. Aree Code S17 788-0S50 September 9, 1976 3 p ,, q

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Mr James G Keppler ,

d-D ds Jj Office of Inspection & Enforcement Region III hE2]i!//#!I.

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US Nuclear Regulatory Commission '. J <

799 Roosevelt Road \  !'K Glen Ellyn, IL 60137 \

DOCKET 50-255, LICENSE DPR PALISADES PLANT - EB-76 ROD SEQUENCER OPERATION Attached is a reportable event related to the Palisades Plant.

David A Bixel (Signed)

David A Bixel Assistant Nuclear Licensing Administrator

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